                    &\multicolumn{1}{c}{(1)}         &\multicolumn{1}{c}{(2)}         &\multicolumn{1}{c}{(3)}         &\multicolumn{1}{c}{(4)}         &\multicolumn{1}{c}{(5)}         &\multicolumn{1}{c}{(6)}         &\multicolumn{1}{c}{(7)}         &\multicolumn{1}{c}{(8)}         \\
\hline
ln(other cost) - ln(hp cost)&       0.152\sym{***}&                     &                     &                     &                     &                     &                     &       0.100\sym{**} \\
                    &     (0.018)         &                     &                     &                     &                     &                     &                     &     (0.031)         \\
[1em]
\$30-59k             &                     &      -0.021         &                     &                     &                     &                     &                     &      -0.014         \\
                    &                     &     (0.013)         &                     &                     &                     &                     &                     &     (0.012)         \\
[1em]
\$60-99k             &                     &      -0.039\sym{**} &                     &                     &                     &                     &                     &      -0.018         \\
                    &                     &     (0.013)         &                     &                     &                     &                     &                     &     (0.013)         \\
[1em]
\$100k+              &                     &      -0.062\sym{***}&                     &                     &                     &                     &                     &      -0.027\sym{*}  \\
                    &                     &     (0.013)         &                     &                     &                     &                     &                     &     (0.013)         \\
[1em]
Black               &                     &                     &       0.030\sym{*}  &                     &                     &                     &                     &      -0.004         \\
                    &                     &                     &     (0.014)         &                     &                     &                     &                     &     (0.014)         \\
[1em]
Nat.Am.             &                     &                     &       0.048         &                     &                     &                     &                     &       0.034         \\
                    &                     &                     &     (0.061)         &                     &                     &                     &                     &     (0.057)         \\
[1em]
Asian               &                     &                     &       0.014         &                     &                     &                     &                     &       0.010         \\
                    &                     &                     &     (0.019)         &                     &                     &                     &                     &     (0.018)         \\
[1em]
Other               &                     &                     &       0.062\sym{*}  &                     &                     &                     &                     &       0.015         \\
                    &                     &                     &     (0.025)         &                     &                     &                     &                     &     (0.025)         \\
[1em]
Owner               &                     &                     &                     &      -0.058\sym{***}&                     &                     &                     &      -0.053\sym{***}\\
                    &                     &                     &                     &     (0.009)         &                     &                     &                     &     (0.010)         \\
[1em]
Rural               &                     &                     &                     &                     &       0.010         &                     &                     &       0.032\sym{*}  \\
                    &                     &                     &                     &                     &     (0.013)         &                     &                     &     (0.013)         \\
[1em]
Northeast           &                     &                     &                     &                     &                     &       0.010         &                     &       0.007         \\
                    &                     &                     &                     &                     &                     &     (0.008)         &                     &     (0.008)         \\
[1em]
South               &                     &                     &                     &                     &                     &       0.092\sym{***}&                     &       0.048\sym{*}  \\
                    &                     &                     &                     &                     &                     &     (0.011)         &                     &     (0.019)         \\
[1em]
West                &                     &                     &                     &                     &                     &       0.012         &                     &      -0.015         \\
                    &                     &                     &                     &                     &                     &     (0.009)         &                     &     (0.012)         \\
[1em]
1950s               &                     &                     &                     &                     &                     &                     &       0.024\sym{*}  &       0.017         \\
                    &                     &                     &                     &                     &                     &                     &     (0.012)         &     (0.012)         \\
[1em]
1960s               &                     &                     &                     &                     &                     &                     &       0.028\sym{*}  &       0.016         \\
                    &                     &                     &                     &                     &                     &                     &     (0.013)         &     (0.013)         \\
[1em]
1970s               &                     &                     &                     &                     &                     &                     &       0.036\sym{**} &       0.019         \\
                    &                     &                     &                     &                     &                     &                     &     (0.013)         &     (0.013)         \\
[1em]
1980s               &                     &                     &                     &                     &                     &                     &       0.046\sym{**} &       0.025         \\
                    &                     &                     &                     &                     &                     &                     &     (0.015)         &     (0.015)         \\
[1em]
1990s               &                     &                     &                     &                     &                     &                     &       0.035\sym{*}  &       0.025         \\
                    &                     &                     &                     &                     &                     &                     &     (0.015)         &     (0.014)         \\
[1em]
2000s               &                     &                     &                     &                     &                     &                     &       0.006         &       0.005         \\
                    &                     &                     &                     &                     &                     &                     &     (0.015)         &     (0.016)         \\
\hline
Observations        &       24485         &       24485         &       24485         &       24485         &       24485         &       24485         &       24485         &       24485         \\
